Yeah if you are using it as a pc monitor, then pc speakers are the only way to get sound to work unless you fork out on lots of expensive audio equipment. There are some good 5.1 and even 7.1 pc speaker systems out there though that really do a job.
Only way to get sound from the tv for watching dvds would be to use a seperate dvd player, but lol when you have a pc hooked up to it.